Also includes fix to default text, and removal of a seemingly unused,
hardcoded 'estimated_time' context variable. A11y test uncommented.

TNL-3930, TNL-3761

Generalizing the display of completed assessments in staff tools, and
including staff assessments in the view, which had previously been missing.

Includes a new unit test for this behavior, and updates acceptance tests as well.

Now setting self.editor_assessments_order whenever we correct it for
template rendering, and modifying the logic to be more careful with
how assessments types not-specified-by-the-user are presented so
that they remain in the default, legal order.

TNL-4019

TNL-4018

TNL-4027

Simplfying logic for display strings in all "user action needed" states.

With staff now being a possibility, we need to update oa_response_complete.
Now keeping "Needs to be graded" and "You need to do things" separate. Includes
test fixes.

Emulating the approach used by peer_mixin to allow staff to actually
see uploaded files. Also updates oa_student_info to make use of
oa_uploaded_file.html instead of duplicating that logic. Test
updates also included.

TNL-3932

TNL-3999

The crux of this fix is that scored_only behavior in various api/peer.py
methods is no longer needed, or correct. This value has been removed, so
that assessments may be gotten (and medians found) when the assessments
are not used in determining the final score (say, if a staff score exists).

Also includes updates to the "waiting for steps" string as prescribed by
@catong in https://github.com/edx/edx-ora2/pull/764, along with logic for
that method, and updates to tests and get_wating_details logic in light
of this simplification.

TNL-3958

The refresh model in the staff grading form changed.
Also add a "scrollToTop" call when continuing grading.

TNL-3870

Part 2 (TNL-3493)

TNL-3493

Updating a user-facing string to include staff grading. Also updating
some dangerously outdated documentation in code that was unearthed
during PR review.

Able to enable full staff grading from studio, save without errors, and view
the staff grading step as expected from LMS.

Includes:
    -template additions, staff grading disabled by default
    -fetching real staff requirements
    -javascript to hook into the python backend
    -changing some default assumptions about assessment types
    -modifications to validation
    -small bugfix for scroll behaviorwith validation alert.
    -updates to existing unit tests
    -additional validation, serialization, and javascript tests
    -fix for staff requirements bug (no more duble-unpacking)
    -updates the bundled studio js file
    -moving StaffWorkflow initilization to api's on_init() method
    -acceptance tests (lms)
    -addition of "Staff Assessment Section" to test course for bokchoy tests
    -renaming `requirements` to `<type>_requirements` in assessment apis

TNL-3889

TNL-3465

Previously, api.update_from_assessments() would call model.
update_from_assessments(), then api._serialized_with_details(reqs), which
would duplicate the update work we *just* did as part of getting the
status. Now, update() and get_details() are totally seperate operations, and
_serialized_with_details() is a read-only method that does not need to have
requirements passed in.

I've also standardized student_training and peer, the two assessment types that
do *not* auto-complete on None requirements, to return False if None, and error
out if passed {}. This is to allow staff_assess to pass None to indicate
"Update thyself, if you don't depend on requirements" to the other step types.

Also adding test_requirements_changed(), to confirm that workflows are updated
when requirements change, even though thoe requirements are no longer explicitly
passed to the getter.

TNL-3464

Add a test to verify that it is working as expected.